# Layers of the Earth - Pasco County Schools

Layers of the Earth Layers of the Earth Song https://www.youtube.com/watch?v=Q9j1xGax YzY Watch the movie trailer for Journey to the Center of the Earth. Identify characteristics

that you think are true and those you think are not true. Be prepared to share. https://www.youtube.com/watch?v=r Qx2wLyagk4 Essential Question: HOW CAN THE LAYERS OF THE

EARTH BE DESCRIBED & COMPARED? 7th Grade NGSunshine State Science Standard: Compare and contrast the Earths crust, mantle, and core including temperature, density, and composition. The Earth is made up of 3

main layers: Crust Mantle Core Think of the layers of the Earth like the layers of a cake.

Use the Layers of the Earth Foldable to take notes Land Ocean O

ru C c i n cea

st Contine ntal Cru st Crust

The Crust Outer layer 5-100 km thick 2 types of crust Oceanic (very dense, made of basalt) Continental (less dense, made of

granite) Oceanic and Continental Crust Granite/older Basalt/Younger

The Crust The crust is only about 35 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents

Crust Land Ocean st u

r C c i n Ocea Continent

a l Crust Thinnest layer of the Earth that ranges from only 2 miles in some areas of the ocean floor to 75 miles deep under mountains Made up of large amounts of silicon and aluminum

Two types of crust: oceanic crust and continental crust Composed of plates on which the continents and oceans rest The Earths crust is like the skin of an apple. Turn to an elbow partner and discuss why this statement is true. Next, come up with another example.

Upper Mantle Convection Currents Lower Mantle Mantle

Middle Mantle Upper Mantle Mantle Convection

Currents Middle Mantle Lower Mantle Solid but capable of flow (like hot asphalt or fudge)

Thickest layer of the Earth (making up 70% of the Earths mass) The hot material (magma) in the mantle rises to the top of the mantle, cools, then sinks, reheats, and rises again. These convection currents cause changes in the Earths surface Outer

Core Inner Core Core Outer Core

Molten (liquid) metal that is about 4,700C (8,500F) Located about 1,800 miles beneath the crust and is about 1,400 miles thick Composed of the melted metals nickel and iron Inner

Core Solid sphere composed mostly of iron It is believed to be as hot as 6,650C (12,000F) Heat in the core is probably generated by the radioactive decay of uranium and other elements It is solid because of the pressure from the outer core, mantle, and crust compressing it tremendously

Come up with another analogy and be prepared to share. The Earth is like a peach or a boiled egg. Turn to a seat partner and discuss these analogies. Crust

Mantle Outer Core Liquid Lithosphere Crust and Upper Layer of the Mantle Layer of the Mantle

(asthenosphere) that consists of hot rock of tar-like consistency, which slowly moves Inner Core Solid

Physical Properties and Composition Composition= what its made of Physical properties= characteristic that is unique and helps to identify the substance (temp, size, shape, color)

Example: Chocolate Chip Cookies Composition- flour, eggs, sugar, chocolate chips, baking powder, butter Physical Properties- round, rough, sweet, tan and black, hot, lumpy Physical Structure of the Earth *Lithosphere- rigid outer layer

(crust) *Asthenosphere- solid rock that flows slowly (like hot asphalt) *Mesosphere- lower part of the mantle Lithosphere The lithosphere (geosphere) is the

"solid" part of Earth. It has two parts, the crust and the upper mantle The lithosphere sits on the asthenosphere. The Earths Plates are the lithosphere. It is the rocky, solid portion of the crust. Remember that it is made up of mostly Silicon( Si) and Oxygen (O).

The lithosphere (crust and upper mantle) is divided into separate plates which move very slowly in response to the convecting part of the mantle. Asthenosphere This is the layer below the lithosphere.

This layer is plastic like. It is somewhat solid/liquid. You can say that it is malleable. Very important in terms of plate tectonics. Mesosphere Bottom Mantle strong, lower

part of the mantle layer between asthenosphere and core Tectonic Plates Earths crust is broken into about 19

pieces These plates move on top of the asthenosphere What do these two images tell us about the layers of the Earth? Temperature

increases as depth increases Look at the information in the graph and table below. Whats the relationship between depth and density/pressure? Density and Pressure increase as depth increases

Temperature, Density and Pressure increases as depth increases Add this statement to the arrow going down on your foldable.

Which layer of the Earth has the greatest temperature, pressure, and density? Core How do we know?

Seismic waves produced by earthquakes travel at different speeds through solid rock and liquids

Summary The earth is layered with a lithosphere (crust and uppermost mantle), convecting mantle, and a dense metallic core. Pressure, temperature,

and density increases as depth increases. http://www.learner.org/interactives/dynamice arth/structure.html Mr. Lees Layers of th e Earth Rap Layers of the Earth Review

Summarizing Strategy Writing Activity Write a paragraph about the earths layers. Include 4 facts from this presentation.

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